How to customize PHP configuration settings with USER.INI

With the introduction of PHP 5.3, we are providing you with the ability to upload your own user.ini files, which are used to modify PHP configuration settings on your account.

If you've used a php.ini file on a linux server, this is the same concept. You simply create a text file named user.ini in the root of your account. The file can include PHP settings such as:
upload_max_filesize = "200M"
date.timezone = "Europe/London"
Here is a list of some PHP configuration settings you can adjust with your user.ini file.  Settings marked PHP_INI_PERDIR, PHP_INI_ALL and PHP_INI_USER in the "Changeable" column can all be changed. Settings marked PHP.INI ONLY and PHP_INI_SYSTEM are server level settings that cannot be changed using user.ini.
These settings will be changed on your site only. While most of these settings are safe to change, the user.ini file does give you a lot of control over how PHP works for your site, so use your best judgement as to what you wish to change.

If you find that you've made a change that causes problems with your site, simply remove the line(s) causing trouble and re-upload the file. Note that there is a five minute server cache for user.ini changes, so you may not see your changes until a few minutes after uploading.